Smartwool Merino 250 Baselayer One-Piece

Pros:

Onesies are all the rage right now. Why? Because they’re freakin’ awesome, that’s why. But seriously, onesies are surprisingly practical. Smartwool’s Merino 250 Base Layer One Piece cocoons you in warm, breathable wool fabric from the top of your head to your ankles. The onesie style is a plus on powder days, namely because you’ll never cringe when snow brushes against your bare skin, and Smartwool's merino wool wizardry makes this One Piece tough to beat. 

The One Piece is feature-rich for a base layer. In addition to the rad hood, which fits comfortably under a helmet or hat, the onesie sports a zippered chest pocket, zippered bum flap and fly to make emergency pit stops a breeze, and thumbholes at the cuffs.

We also loved the One Piece’s semi-loose fit—it isn’t crazy tight like some of the speed-racer onesies out there. Throw a two-tone charcoal colorway into the mix, and the One Piece actually looks sharp, too.

Cons:

The 250 merino wool interlock knit fabric, which we love, is a touch on the heavy side for backcountry touring if temps are balmy.

Tester Comments:

“Man—I do love a onesie. And this Smartwool option is one of my favorites I’ve ever tested. It’s comfy, not too tight, and breathable on the hill. Plus it has built-in hood and looks as good as a onesie can possibly look. What’s not to love?”

Bottom Line:

Whether you’re a onesie aficionado or new to the game, Smartwool’s One Piece is top-notch and our favorite option for powder days.